#### cut vertices in list, restore neighbors of list ####
-------------------------------------------
funct (left-click): cut selected list of single vertices
  cut_vertices
-------------------------------------------
funct (middle-click): restore neighbors of selected list
  uncut_connected_vertices
-------------------------------------------
funct (shift-middle-click): setup catch stray points
  set pointsflag 1
  set pointsize 2
  arrownormctrls
-------------------------------------------


Detailed Description of "PTS" Button Actions

-------------------------------------------
funct (left-click):
  cut_vertices -- cut list of single selected vertices
-------------------------------------------

Remove single vertices in currently selected list
(this is also used by LINE and AREA if only one
vertex is selected).

Useful for quickly trimming ragged edges of a
label.

  1) recut label with "C" on "label:" line

  2) select one or more edge vertices to trim

  3) left-click PTS

This can also make hole(s) in the middle of a
label.

After patching using PTS, it's a good idea to
zoom in, and turn on MESH in order to see and
clean up stray remaining single edges (these
won't be visible as surface triangles).

-------------------------------------------
Alt funct (middle-click):
  uncut_connected_vertices -- restore neighbors selected list
-------------------------------------------

Restore any invisible neighbors of each vertex in
the current list.

This can be used to locally extend the edge of a
label as follows:

  1) recut label with "C" on "label:" line

  2) select one or more edge vertices to extend

  3) middle-click PTS

This can also be used to patch a hole in the
middle of a label.

-------------------------------------------
Alt funct (shfit-middle-click):
  set pointsflag 1
  set pointsize 2
  arrownormctrls
-------------------------------------------

After manipulating a label with FILL, PTS, and
functions that cut or add label parts, stray
vertices may remain.  These are invisible with
normal window settings.  This function makes them
visible, and a popup to set back to the default
condition, which is pointsflag=0 and pointsize=1.

